TY  - JOUR
TI  - Cardioceratid and kosmoceratid ammonites from the Callovian of Yorkshire
T2  - Palaeontology
VL  - 32
UR  - https://www.biodiversitylibrary.org/part/173975
PB  - Palaeontological Association
CY  - London
PY  - 1989
SP  - 799
EP  - 836
AU  - Callomon, John H. (John Hannes), 
AU  - Wright, J. K. (John Kenneth)
ER  -