Bob Hoffman pretty much single handedly propped up American weightlifting from the 1930's through to the 1960s. He created York Barbell from his oil burner business and from there went on to build an empire of weightlifting. He had his own magazine, barbell business, food supplements and the famous York gang who with legends such as John Grimek, Steve Stanko, John Terpak, Tony Terlazzo dominating Olympic weightlifting and bodybuilding in the 1930s and 40s. The York Barbell courses were well known, coming with your barbell purchase and helped thousands of people develop strength. Below are some of those very courses from my collection.
York Course 1 and 2
York Course 3 and 4
Simplified System of Barbell Training
Simplified System of Dumbell Training
Advanced Methods of Weight Training
Abdominal Course
Leg Development Course
The Road to Super Strength