Balalaika playing technique: scales and exercises,method for all levels compiled by I. Inshakov, A. Gorbachev. The balalaika is a Russian three stringed lute.
An introduction to the gu-zheng by Angela Jui Lee and Mark Gresham. The zheng is a 16 to 21 string zither from
You can teach yourself pan flute by Costel Puscoiu. Sukay workbook and how to make and play the flutes of the Andes, Kena & Zampoña. Both of these works teach the panpipes - the former according to Eastern European tradition and the latter according to South American tradition.
Reggae drumming by Peter Epting. Tito Puente's drumming with the Mambo King by Tito Puente and Jim Payne. These books explain drumming techniques in the Jamaican and Cuban popular styles respectively.
Illustrations from Lavignac’s Encyclopédie de la musique et dictionnaire du Conservatoire and the Lyon & Healy Complete musical merchandise catalogue.