Each 3-Pack consists of three Memo Books, one each for the Mercury, Gemini, and Apollo programs. These books are full of facts and figures. They feature dramatic photographs of iconic moments from those missions on the covers, printed in full process color, plus “Orbital Silver” metallic ink and an aqueous coating. The insides are Finch Opaque 60#T white graph paper with the rules printed in an extremely light “Firmament Gray” ink. Those pages will be helpful in planning a summer picnic, or calculating optimal orbital trajectories and eccentricities.