I was always frustrated using lunar atlases (like Rukl's) because the pictures never matched the detail I saw at the eyepiece of my refractor. I then found out about the Lunar Orbiter Atlas series produced by Nasa. These atlases are a compilation of the Lunar Orbiter IV photography. This version is the "NASA SP-241: Atlas and Gazetteer of the Near Side of the Moon" which is a 10"x 14" hardcover book with 538 pages containing 404 of the best images of the nearside of the moon. What really makes this atlas useful for observing is that the lunar features are labeled on each photograph and then cross-referenced alphabetically in the rear index of the book. The lunar detail is incredible. For example, you can count 120+ craterlets on the floor of Plato (Rukl shows only 5)! I have observed 14 craterlets in plato and the LOA was very useful to use for confirmation. I have two copies of the Gazetteer and plan to sell one. This copy's pages and photos are excellent but the cover is only in fair condition (the cloth is faded with some stains...this atlas is 30 years old!). If there are any hardcore lunar observers out there I will sell it for $175 shipped.