ISBN 9781172122134 books & textbook
Sun's Spotted Area, 1832-1900. a Statement of the Mean Daily Area in Each Synodic Rotation of the Sun, Based Upon Data Collected at the Solar Physics Observatory, South Kensington
Nabu Press /2010-10-14 Paperback / 50 Pages
isbn-10: 117212213X / isbn-13: 9781172122134
