This is a long shot question but has anyone ever encountered the "Riverside Steel Standard Girder Handbook"? I have a project in California and the existing 1978 building drawings indicate tapered steel girders at the roof (see attached for snip from general notes and plans). So far, I cannot find anything online about this handbook. It does seem that Riverside Steel was the fabricator (they do not seem to be around anymore) for the building and that maybe this was a unique handbook to the fabricator but this is somewhat speculative.
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