Here is an item that may be useful to those doing research on pre-WWII tanks: “Cooperative Bibliographies No. 1 :Tank and other Military Track-Laying Vehicles” by Douglas Bryant. According to the preface, this document “has been compiled chiefly for the use of those people interested in the design and production of tanks and other military track-laying vehicles. Material on the use of such vehicles and on their tactics in battle has not been included. The bibliography lists what is, in the compiler’s opinion, the best description and technical literature available to the public.”
The document may be viewed at the Hathi Trust Digital Library website.