PT  - JOURNAL ARTICLE
AU  - George Huntington Williams
TI  - The volcanic rocks of South Mountain in Pennsylvania and Maryland
AID  - 10.2475/ajs.s3-44.264.482
DP  - 1892 Dec 01
TA  - American Journal of Science
PG  - 482--496
VI  - s3-44
IP  - 264
4099  - http://www.ajsonline.org/content/s3-44/264/482.short
4100  - http://www.ajsonline.org/content/s3-44/264/482.full
SO  - Am J Sci1892 Dec 01; s3-44