How often are the books/software/services updated per year?
A Used Car Guide: (6) Jan/Mar/May/July/Sept/Nov Older Car Guide (3) Jan/May/Sept Early Model Guide (2) Jan/July Residual Guide (6) Jan/Mar/May/July/Sept/Nov New Car Price Manual (4) Issued 4 times a year Consumer Guide (2) Jan/July Motor Home Guide (3) Jan/May/Sept Travel Trailer Guide (2) Apr/Oct Motorcycle Guide (3) Jan/May/Sept Manufactured Housing (2) Oct/Apr Advanced Sheet (6) Jan/Mar/May/July/Sept/Nov