Anil R. Bohora and Gylfi K. Snorrason have just published a new catalog called Banknotes of Bhutan (ISBN 978-81-7525-881-5). This 137-page softcover book is beautifully illustrated in full color throughout, with large front and back images of all notes, and details of vignettes that are thoroughly explained. The book contains everything there is to know about the kings, monuments, and auspicious symbols that appear on Bhutanese notes, as well as the signatories, watermarks, and printers.
I highly recommend Banknotes of Bhutan to anyone interested in this Asian country’s numismatic history. The book costs US$25 + $6 S&H and can be purchased by emailing firstname.lastname@example.org.