the UCLA Chicano Studies Research Center,
the Arhoolie Foundation,
and the UCLA Digital Library
I have this 45 by Lalo, and I was looking for the date it was released. I checked Google for the 45 RCA Victor discography. And there was a site (45rpmrecords.com) with the page "Date Your RCA Victor pressings." According to this page, this 45 was released in 1954.
It is fantastic that you created this great discography of "Latin" vinyl.
There is one thing that I wish, that the person who catalogs these records did not mark the labels. You devalue the 45 (when you mark the label).