books.google.com - Venus and Mercury have always been regarded as difficult targets for amateurs, but advances in commercially-made instruments have brought them within range of only moderately experienced observers. The concept of this book is to present an up-to-date detailed description of the history and geology of...http://books.google.com/books/about/Venus_and_Mercury_and_how_to_Observe_The.html?id=LqwUuMYIEtkC&utm_source=gb-gplus-shareVenus and Mercury, and how to Observe Them
