Here is an interesting New Mexico Territorial cover I just won at an auction site...
Front and Rear shown.
OK, as far as the postmark trail (as I see it) goes something like this...
Postmarked Santa Fe (Mar 15, 1911) front
Postmarked Domingo (Mar 16 1911 RCVD) rear
Postmarked Bland (Mar 16, 1911) rear
Postmarked Bland (Mar 17, 1911) front
Postmarked Domingo (Mar 17, 1911 RCVD) rear
Postmarked Placitas (Mar 18, 1911) rear
Busy little envelope. Enjoy.