I hope you don’t mind.But I found yesterday, a very good copyright free website.http://www.archive.org/details/TheVideoCellarCollectionMembers might be interested, in looking because. Their is an invaluable assortment of copyright free Astronomy books in PDF. I have four of these now.Through my Telescope W T Hay (Will Hay)Star light Nights Leslie C PeltierMission to Mars by Sir Patrick MooreCelestial Objects for Common Telescope’s Rev T W Webb
Yes, the American Libraries Internet Archive has many interesting old books to view for free, Paul.Another online book I have enjoyed lately is one that purports to list all observatories and astronomers worldwide in 1907. You can see who was living and observing near you in 1907. http://www.archive.org/details/lesobservatoire00delpgoogYou can select to read on line – or download if you prefer.Something for a cloudy night. Go well!Jeremy