TY  - RPRT
TI  - Contributions to economic geology, 1905: Portland, natural, and Puzzolan cements
AU  - E.C. Eckel
AU  - Henry Landes
PY  - 1906
DO  - 10.3133/b285i
UR  - https://pubs.usgs.gov/publication/b285I
ID  - b285I
ER  -