The all-time great handbooks written on Indian philately
Military & Used Abroad
Expeditionary Forces, Army Postal Services, and India Used Abroad.
Fiscals, Stationery, etc
Modern & Others
A wide range of modern books covering modern subjects
Indian States - Convention & Feudatory
From the early journals of the 19th century to those through the beginning of the 21st.
'Name' sales and Important & Not-so-important India material sales
Airmails & Maritime
Maritime books of the 19th century and airmails of the 20th