The foundry sands of Minnesota,
Knapp, George N.
The foundry sands of Minnesota, by G. N. Knapp. - Minneapolis, The University of Minnesota, 1923. - vi, 105 p. illus. 23 cm. - Minnesota. Geological survey. Bulletin no. 18 .
At head of title: The University of Minnesota.
gs 23000113
Sand.
QE127 / .A22 no. 18
The foundry sands of Minnesota, by G. N. Knapp. - Minneapolis, The University of Minnesota, 1923. - vi, 105 p. illus. 23 cm. - Minnesota. Geological survey. Bulletin no. 18 .
At head of title: The University of Minnesota.
gs 23000113
Sand.
QE127 / .A22 no. 18