You might not be aware of the fact that the numbering system for the microfilm from FamilySearch and available at the Family History Library has changed over the years. Here is a quote on the subject from the FamilySearch.org Research Wiki article entitled, "Old film numbers."
The old GS (Genealogical Society) film numbers refer to a former catalog numbering system. They were five-digit numbers followed by a one- to four-digit part number. Here are several ways to convert the old GS film numbers into the current Family History Library film numbers.There are also other articles in the Research Wiki on the same subject:
- Use the "Old microfilm number conversion" charts in this wiki.
- Search the The FamilySearch Catalog by the locality or author of the record on the film.
- Consult List of all film call numbers in the Genealogical Society from 1938 to April 1958, Church of Jesus Christ of Latter-day Saints, Genealogical Society, Library Division. Available on fiche.
- Use the old CD version of the catalog in the DOS version of FamilySearch. This version is available in the Family History Library in Salt Lake City and may be available in a family history center near you. The center staff can help you convert the number.
- Old Book and Film Numbers Used by the Family History Library
- Converting Old FHL Film Numbers to Current Numbers
- Category:Old microfilm number conversion
These are rather extensive articles. Here are even more references on the subject of searching in the FamilySearch Catalog:
- Introduction to the FamilySearch Catalog
- FamilySearch Catalog Place Search
- FamilySearch Catalog Surname Search
- FamilySearch Catalog Keyword Search
- FamilySearch Catalog Title Search
- FamilySearch Catalog Film and Fiche Search
- FamilySearch Catalog Author Search
- FamilySearch Catalog Subject Search
- FamilySearch Catalog Call Number Search (for books and other printed materials)