North American Nature Photography Association
NANPA, the North American Nature Photography Association, was officially established in 1994 by a contingent of nature photography devotees. NANPA is the first and only association in North America committed to serving the field of nature photography. The stated mission is to provide education, foster professional and ethical conduct, gather and disseminate information, and develop standards for all persons interested in the field of nature photography. NANPA further seeks to promote nature photography as an art form and a medium of communication for the sciences, nature appreciation and environmental protection.
I use these markers for children's illustrations, and they are wonderful. I do wish there were more color options for colors. I've found the light colors too few, especially when working with skin tones These pens last a very long time and work well with all sorts of papers. The tip options make this a great marker for precision coloring.