You limited your search to:
Year:
1940
Collection:
Government Documents A to Z Digitization Project
Collection:
World War Two Collection
- Theory of ballooning.
- A general guide to piloting a free balloon. digital.library.unt.edu/ark:/67531/metadc9808/
- Lathes
- A guide to the operation and maintenance of lathes for general shop work. digital.library.unt.edu/ark:/67531/metadc96655/
- Grinding machines
- This report provides the definition of grinding and discusses different processes, types, and operations of grinding. digital.library.unt.edu/ark:/67531/metadc96656/