TY  - RPRT
TI  - Chemical composition of igneous rocks expressed by means of diagrams, with reference to rock classification on a quantitative chemico-mineralogical basis
AU  - J. P. Iddings
PY  - 1903
DO  - 10.3133/pp18
UR  - https://pubs.usgs.gov/publication/pp18
ID  - pp18
ER  -