Generally the box sets consisted of three 45s and used the same graphics RCA Victor had used on the 78 album.
Because most 78 albums consisted of four records, some 45s in box sets will appear to have no 78 equivalent.
The 47-00 series was designated for childrens records but RCA Victor didn't use many numbers.
The 47-1000 series was skipped completely and the 47-2000 popular mono series starts at 47-2715 with a reissue of a 78 originally released in July of 1941.
By the end of 1951 45 box sets were phased out and replaced with Extended Play records (EPs).
The 45s are cross-referenced to their 78 equivalent when known.
If there is a date in parentheses that is the release date of the 78 the 45 is a reissue of.
This is probably most interesting at the beginning of the series as it allows one to get an idea how old the recordings were that constituted some of the first 45s.
The beginning of the 47 series is a bit perplexing.
With the introduction of the 45 was also the introduction of the 45 box set, which consisted of multiple 45s creating an “album”.
The 45 box set numbers are a continuation of the numbering system used for 78 albums with a “W” added in front of the “P” (Popular) used on the 78 albums.
Generally RCA Victor, in making a 45 box set, issued 45s of the first two 78s in an album and the third 45 consisted of one side from each of the remaining two 78s.
RCA Victor box sets are indicated by a number starting with “WP” which will be above the 47 prefix number.