Wikipedia:Articles for deletion/Topo (climbing)
or merge. With a 5-minute  style search, I was able to locate two books talking about this kind of map and added them to the article.  There are other refs that discuss these diagrams and various groups like http://www.supertopo.com/index.html SuperTopo, dedicated to creating topos. Hence there seems adequate sourcing out there for this topic. Topos are usually a part of a climbing guide, so a merge to Climbing guidebook would also be reasonable. But outright deletion of verifiable material is the wrong course of action per  and 
— User:Mark, 18:54, 11 September 2017 (UTC)
Stance: keep
Cited policy: WP:BEFORE||WP:ATD||WP:PRESERVE (Wikipedia:Articles for deletion)