Just found these USDA handbooks. To say wealth of information is the understatement of the year. Sure many were writtten in the 50's but retrotastic. Over 700 titles including;
Cheese varieties and descriptions.
Small sawmills: a pocket guide. [see what they did there?? -ed.]
Egg grading manual.
Canning in glass jars in community canning centers.
First aid for flooded homes and farms.
Snow-survey safety guide.
My favourite so far is The Northeastern Loggers Handbook. Tons of illustrations and older photos. Clear the calendar...