Actually the topic of walrus ivory at least as pertains to Indian arms was dealt with in a chapter by Dr. G.N.Pant in his "Indian Arms and Armour" (1979).
Returning to the regional history of Central Asian areas including Afghanistan which gives outstanding overview of the geopolitical turmoil and tribal interaction is "The Great Game" by Peter Hopkirk, I do not recall date of publication.
Most of these topics mentioned have been discussed at length on these pages over the past fifteen years, and the search feature will reveal the discourse and findings often reached. There are a good number of members here who are most impressively versed in the metallurgy of these weapons (I am not one unfortunately
) . We have always tried to include sources and cites in discussions and as a result the search on certain topics will often show the amazing bibliography of references used through these.
Most of the movement of these valuable commodities and materials are of course important in the study of trade routes and cultural interaction throughout history. The study of these venues is also an excellent source for understanding the diffusion of many weapon forms as well as thier development and history, one of the very important aspects of our studies here.