the 10" records were the old 78s which, from memory, could only cope with about two and a half minutes. The early EPs (45 rpm) weren't much better - in fact, they weren't really 'EPs' at all - but were quickly improved by a narrower, more tightly packed groove. 33 1/3 LPs were already around - certainly by 1963 both 'proper' EPs and LPs were available.
Mike