2 are the department of the interior geological surveys (Red River Quadrangle and Bouquet Resevoir Quadrangle and Palmdale Quadrangle). The fourth is the war department of The Tujunga Triangle. Very detailed and intricate with earthquake fault lines, elevations, roads, towns etc. would be nice framed. The are approximately 21 x 18 x. 21 x 23, give or take. Difficult to measure because they are rolled up. Will be sent in a tube. Don’t want to separate. Fairly good condition. Some roughness on edges.