TY  - RPRT
TI  - Expanding with paperbacks.
AU  - R G Thomson
AU  - J V Toohey
PY  - 1967
DO  - 10.1111/j.1746-1561.1967.tb03000.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5182539/
ID  - 5182539
ER  -