To the right are Peggy Printz's sketches from Bhutan.
Here are a few books I've bought at the Morgan that feature works on paper, many of them travel sketches and watercolors:
Sketching at Home and Abroad: British Landscape Drawings, 1750-1850 (The Morgan Library)
Tales and Travels, by Kathleen Stuart (The Morgan Library)
The Thaw Collection of Master Drawings (The Morgan Library)