Houchins "L.C. Smith: The Legend Lives", published in 2006 mostly used Lt. Col. Brophy's estimates, some of which were published in "L.C. Smith Shotguns" in 1977
Marlin Firearms Co. gave the original shipping ledgers, reportedly rescued from a dumpster by Brophy, to the McCracken Research Library at the BBHC in Cody, which were placed on microfiche.
The LCSCA acquired a set of these microfiche records in 2008 and Dr Jim converted them to PDF files and used 2 computers to exam each line and enter the information on another database - more than 500,000 shotguns; now sorted by grade, gauge, barrel length, options, DOM.
So Dr Jim's information is a. the same as Cody's but more refined and b. the best we have. Unfortunately some shipping ledgers were lost.