TY  - RPRT
TI  - The study of comets, part 1
AU  - Donn, B.
AU  - Mumma, M. J.
AU  - Jackson, W. M.
AU  - Ahearn, M.
AU  - Harrington, R.
PY  - 1976
UR  - https://ntrs.nasa.gov/citations/19760013964
ID  - 19760013964
ER  -