The reason isn't laziness but lack of material. But I now have a new Indian White Circle. This is an uncommon non-fiction White Circle that had been successfully published in the US (1941), UK (1942), and Canada (1946). The Indian edition is, to my knowledge, the only early paperback version. It was published in 1946 in Bombay by W.A.R. Collins.
I wonder what an Indian audience in 1946 thought of salmon fishing in Canada.