PT  - JOURNAL ARTICLE
AU  - Asa Gray
TI  - Memorials of George Engelmann and of Oswald Heer
AID  - 10.2475/ajs.s3-28.163.61
DP  - 1884 Jul 01
TA  - American Journal of Science
PG  - 61--69
VI  - s3-28
IP  - 163
4099  - http://www.ajsonline.org/content/s3-28/163/61.short
4100  - http://www.ajsonline.org/content/s3-28/163/61.full
SO  - Am J Sci1884 Jul 01; s3-28