All articles are copyrighted by the publisher of the article. They can only be downloaded for personal use. Any commercial use or large-scale downloading is prohibited. Please see the Conditions of Use for more details.
We would like to acknowledge the many people and organizations that have helped with this project by donating extra volumes and by giving the ADS permission to scan their copyrighted material.
To access scanned journals please use the Scanned Article Query Page. To access scanned observatory/society publications please use the Observatories Query Page.