Another angle of approach might be to think of special collections in the library, e.g. when somebody's estate gives all their papers to Harvard. Perhaps there are food people in that mix. Julia Child lived down the street for a good while, did her estate drop her stuff on Harvard or someplace else? Going through my own attic turned up food stuff from my grandparents and great grandparents... menus, promotional postcards for restaurants in the 1920s, matchbooks, etc. People not in the food biz kept that kind of stuff... Does the Harvard library have a special annex for that stuff (like the Harry Ransom Center at UT Austin), or is it all under one roof and administration there?
So it does look like some Julia Child stuff landed at Harvard: https://www.radcliffe.harvard.edu/schlesinger-library/collection/julia-child
