KAEMPFFERT, WALDEMAR BERNHARD, ed. A popular history of American invention. Vol. 1-2. v. 2. Material resources and labor-saving machines.
KAEMPFFERT, WALDEMAR BERNHARD, ed. A popular history of American invention. Vol. 1-2. © Waldemar Kaempffert (A) v. 2. Material resources and labor-saving machines. © 17Oct24, A808448. R99981, 23Sep52.
Waldemar Kaempffert|A