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Two books I would recommend - John Deere Tractors and Equipment Vol. I 1837-1959 and Vol II 1960 - 1990 By Don Macmillan. They are about 400 pages each and have to cover a HUGE amount of information so are somewhat vague on any specific piece of equipment. Quick study - Deere built The Waterloo Boys in the 1910s and 20s. They built the D and GP in the late twenties and early forties. The models of this era tend to be quite expesive as a lot of them were melted down to defeat Tojo and Hitler. In the mid 1930s, they dropped the GP and started building the unstyled A B and G these tractors also bring pretty good prices due to rarity. The late 30's brought on the early styled tractors A (35 Hp) B (22 HP) D (42 HP) G (39 HP) H (15 HP LA (15 HP) Prices are very affordable because so many were made. Late 40's brought the M and the R Diesel and the dropping of the H and LA. It also brought the late styled tractors. Thes tractors are affordable as well. Deere made something like 220000 Styled "A"s and 300000 Styled "B"s. Early 50s spelled the end of the lettered series and the 40 50 60 70 80 came about. Thes tractors are a little more than the lettered series in price but also offer a lot more creature comforts like Live PTO and Hydraulics and power steering. At the same time, it make them more complicated to restore. mid fifties - 320 420 520 620 720 820. Late fifties - 330 to 830. These were the last of the two cylinders. they bring good money because they can still be used on a moderately large farm for light tasks and are the most refinded of the two cylinders. 1960 brought the "new generation" 1010 2010 3010 4010 5010. mid 1960 brought the 3020 to 5020. They stuck a 2510 and 2520 in there somewhere. In the late sixties, Deere started making the 4320 4520 4620. These are all hosses and not likely what you're looking for. 1972 was the start of Generation II tractors - 4030 4230 4430 4630 6030. Late 70's 40 series. early 80's 50 series. late 80s 55 series. early 90s 7000 series and 60 series. Mid 90's 6000 series 7000 series 8000 series 9000 series. Then they went to the 7010 8010 etc series. today they're on the 8030 etc series. Deere makes and unbelievable range of tractors today. A lot of the tractors in a given series today are exactly the same chassis, engine, cab, trans etc. The only difference is a computer chip. You can buy an 8230 and make it an 8430 with a chip. Clear as mud? Sorry for the long post. Hope it's helpful.
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