Abstract
The Astrophysics Data System (ADS) is the search system of choice for
Astronomers world-wide. The searchable database contains over 2.6
million bibliographic records. In addition the ADS has over 2 million
scanned article pages from about 280,000 articles, dating back as far
as 1829. There are currently more than 10,000 regular users (more
than 10 queries/month). ADS users issue almost 1 million queries per
month and receive 40 million records and 1.2 million scanned article
pages per month. One important aspect of the ADS is the system of
links to other data providers. We have currently more than 3 million
links to other on-line resources. The ADS is accessed from almost 100
countries with a wide range of the number of queries per country. In
order to improve access from different parts of the world, we maintain 9 mirror sites of the ADS in Brazil, Chile, China, England, France, Germany, India, Japan, and Russia. Automatic procedures facilitate keeping these mirror sites up-to-date over the network. The ADS is funded by NASA Grant NCC5-189. The ADS is available at:
http://ads.harvard.edu
