An interesting selection of vintage farming books, brochures & manuals from the 20th century:

Borbridge's Factory to Farm Catalogue 1921

Homelite Zip Chain Saw Operator's Manual

John Deere 4400 Combine TM 1020 (april 1975)

John Deere 4400 Combine TM 1020 (april 1975) 2nd section

John Deere 490 Corn Planter Operator's Manual

John Deere M10 Series Tractor Cultivator Operator's Manual

John Deere Riding Mower 55 56 Operator's Manual

John Deere Row Crop Cultivator's Operator's Manual

International Harvester Mechanical Irrigation

Noxon Bros. Annual Catalogue 37th. year

the file size is 56MB.