Industry codes such as the North American Industry Classification System (NAICS) codes can be used in business databases to narrow your search.
Search for a code using the link below, or browse the NAICS codes. (companies often operate under several of these broad categories)
Scan trade publications for information and summaries that may be hard to track down.
Trade publications can provide insight and market report summaries not freely found elsewhere on:
Courtesy of umnLibraries, Van Houslon: https://www.youtube.com/watch?v=Ts2RD7hTNqk
Trade associations provide some information on their website (such as the American Association of Candy Technologists)
Limit your search to "Trade Publications"