The performers of the Bentoiu pc1 are Gheorghe Halmoş/Cinematography SO/Edgar Cosma (première, 1957).

The conductor of the Paul Richter works is Ilarion Ionescu-Galati.

A recording that has received little attention is a 2 CD set (Triart Recording TR012) of Josef Páleníček's complete music for piano and orchestra, including his 3 piano concertos and Concertino for Orchestra with Obbligato Piano (https://www.triartmanagement.eu/en/internetovy-obchod/).  I believe the recording of Concerto 1 is the first on CD and perhaps the first to be commercially released (a Czech Radio performance dates from 1971, but I don't think that was ever issued on LP or CD).  The Concertino also appears to be a première release.  The performances by Jitka Čechová and the Prague Radio SO under Ronald Zollman (Concertos 1 & 3) and Stanislav Vavřínek (Concerto 2 & Concertino) are outstanding, and the sound from 2014 is much better than what is on youtube of Concerto 1 and in the earlier Supraphon/Panton recordings by other pianists of Concertos 2 & 3.  The recording of Concerto 1 is in the original scoring for piano, string orchestra, and timpani.  The composer also made a version adding trumpet, 2 flutes, and oboe, which can be heard on youtube https://www.youtube.com/watch?v=Eb9sv8yqEhY
played by the same pianist with the Czech Chamber PO Pardubice under Marek Štilec.  There you can sample Jitka Čechová's virtuosity and musicality as well as Páleníček's compositional style.
 

I beg to differ with Latvian.  The recording of the première of Concerto di camera No. 1 is on the Canadian Music Centre website (performance identified as "Talivaldis Kenins. Conducted by Alfred Strombergs; world premiere, Latvian Festival concert, July 1, 1981, MacMillan Theatre, Toronto") and it is the same work as on the Ondine CD cited by Dave.  A non-commercial recording of Kenins's Concerto di camera 2 can be heard in Miklos Pogonyi's archive:
https://archive.org/details/cd_canadian-composers_talivaldis-kenins_2, and on the Canadian Music Centre website, where the performance is identified as "Talivaldis Kenins. New Music Concerts ensemble conducted by Robin Engleman; premiere performance, Nov. 19, 1983."

rkhenderson added to the "Georgian Music" download folder an unidentified Gudiashvili piano concerto. 

Robert, do you have a recording of another movement of this work?  The two-piano score was published in 1962 with the subtitle "Pictures of Nature" (rather than "Expanses of My Homeland") and has four movements instead of three:  Allegro; Andante cantabile; Allegretto; Allegro, each with a description (in Georgian) of a scene in the composer's homeland.  Only the first three movements are in the recording you uploaded.  Given the date of publication, this would appear to be pc4 (composed in 1961).  Gudiashvili wrote five piano concertos (1941, 1946, 1948, 1961, and 1980); I don't know if he composed of any other large piano-and-orchestra works.  Special thanks to Tony Tung and Malcolm Henbury-Ballan for help in working on this mystery.

The Gudiashvili pc5, third movement only, IS still on youtube at https://www.youtube.com/watch?v=-ygCNJMQdV4.

Gudiashvili's pc5 (1980), third movement only, was on youtube previously, but perhaps has been deleted.  It was played by Ilaria Shevchuk-Shnaider with an unidentified orchestra.  I have a copy of the 2-piano score, so I'm sure this work exists and that the recording is of the third movement.

I'm not sure which of Gudiashvili's four earlier piano concertos was posted by rkhenderson.  Those date from 1941, 1946, 1948, and 1961.  I might note that the pianist's name is Eter Gulisashvili and that Robert's dates for the composer are off by a year (should be 1913-98).  This recording also is listed for sale on the "Best Georgian Music" website.

The score is also on ISMLP.  Golovin's 1990 recording on youtube (from Harmonia mundi/Chant du monde LDC 2880 10) has significant cuts in the solo part, especially in the latter pages.  Bhagwan Thadani's synthesized recording from 2001 (Cantext Publications/Thadani CD 31) is complete, but no match for real performers.  However, anyone wanting to hear what Golovin left out may be interested in that.

Is it Mendelis Bašs, who was best known as a conductor, pedagogue, and composer, or his son Harijs Bašs, who is a pianist?  I have seen this recording attributed to both of them and am not sure.

The composer recorded both his Piano Concertino (1946) and Piano Concerto (1957) with Omroporkest [Netherlands Radio Orchestra], under Henk Spruit and Herbert Soudant, respectively.  As far as I know, these have not been released commercially.  I am not sure if he wrote 2 piano concertos and a concertino, or if the concertino has been mistakenly counted as a concerto.  The concertino dates from 1946 and some sources list the first concerto as from 1947.  His Concerto (1957) appears to have been the one that won the ANV-Visser Neerlandia Prize in 1964.  In the Wikipedia article on that prize, the work is described as "Concerto for Piano and Orchestra", not as Concerto No. 2 <https://nl.wikipedia.org/wiki/ANV-Visser_Neerlandia-prijs?oldid=41921138>.  Perhaps someone else can shed light on this.   

"Malcolm Henbury-Ballan (MHBallan on here) has been kind enough to send me his DAT-format cassette on which this Lyrical Intermezzo was recorded, together with a number of other Bortkiewicz works (see below).  I have transferred them to MP3 format and put in the Downloads section. According to Malcolm all come from the archives of Austrian Radio and were recorded in the 1940s and 1950s.  I hope you enjoy.  Many thanks to Malcolm! Both Ukraine and Russia can claim Bortkiewicz, so I have put these recordings in the downloads sections for both countries!"

Please note that this recording of Bortkiewicz's Piano Concerto No. 1 is heavily cut in the last movement, which runs only 4:33 vs. Hyperion's complete recording of 12:14.  Apparently, performers used to take a lot of liberties with the score; there are different cuts marked by hand in the score on IMSLP and Marjorie Mitchell's recording has various omissions, too.