TY  - BOOK
AU  - Smith,John E.
AU  - Emerson,Frederick V.
TI  - Lesson helps in agricultral geology,: for use with Emerson's Agricultural geology (Wiley & sons)
AV  - QE33 .S57
PY  - 1936///
CY  - [Ames, Iowa?]
KW  - Geology
KW  - Soils
N1  - "References": p. 8, 42-43
ER  -