MAURICE BOULANGER Cat Postcards

 

These cuties are by the French artist Maurice Boulanger (pronunciation: http://www.forvo.com/word/boulanger/) I am trying to collect his 'fantasy dressed animal' cat postcards, however some are very expensive and highly sought after. Some of Boulanger's earliest cards are found published by J. M. of Paris, with several postmarked as early as 1903. Some Boulanger postcards only the have the initials MB on them, while many others are not signed at all. This has led to some confusion amongst both collectors and dealers alike as to whether certain unsigned cards should be attributed to Boulanger or not. His style varies from fantasy (like these) to very realistic.
This is the only article I can locate on MB. http://www.postcardcollecting.co.uk/ppm_online/ppm_10_aug.pdf