COLLECTED BY
Organization:
Internet Archive
The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the
Wayback Machine.
Content crawled via the
Wayback Machine Live Proxy mostly by the Save Page Now feature on web.archive.org.
Liveweb proxy is a component of Internet Archive’s wayback machine project. The liveweb proxy captures the content of a web page in real time, archives it into a ARC or WARC file and returns the ARC/WARC record back to the wayback machine to process. The recorded ARC/WARC file becomes part of the wayback machine in due course of time.
The Wayback Machine - https://web.archive.org/web/20191017190927/https://science.nasa.gov/astrophysics/astrophysics-data-centers/smithsonian-nasa-astrophysics-data-system-ads
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Smithsonian/NASA Astrophysics Data System (ADS)
ADS maintains four bibliographic databases containing more than 4.0 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy. The main body of data in the ADS consists of bibliographic records, which are searchable through Abstract Service query forms, and full-text scans of much of the astronomical literature which can be browsed though the Browse interface.
