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  2. Standard Catalog of World Coins - Wikipedia

    en.wikipedia.org/wiki/Standard_Catalog_of_World...

    Originally covering 1835 or so to date, the main catalog (first edition 1972) evolved into an annual 20th century-only work, plus separate 17th, 18th, and 19th century volumes which are revised on a three-year cycle. Beginning with the 34th (2007) ed, listings covering 2001 to date are included in a separate 21st Century catalog.

  3. United Postal Stationery Society - Wikipedia

    en.wikipedia.org/wiki/United_Postal_Stationery...

    Catalog of the 20th and 21st Century Stamped Envelopes and Wrappers of the United States (2011). ISBN 978-0-9800112-8-9 Wukasch, Ken; Postal Cards of the World's Columbian Exposition , UPSS (2005).

  4. List of solar eclipses in the 21st century - Wikipedia

    en.wikipedia.org/wiki/List_of_solar_eclipses_in...

    This total solar eclipse had a maximum duration of 6 minutes and 38.86 seconds. The longest possible duration of a total solar eclipse is 7 minutes and 32 seconds. The longest annular solar eclipse of the 21st century took place on January 15, 2010, with a duration of 11 minutes and 7.8 seconds. The maximum possible duration is 12 minutes and ...

  5. Category:Years of the 21st century - Wikipedia

    en.wikipedia.org/wiki/Category:Years_of_the_21st...

    Years of the 21st century by country (272 C) This page was last edited on 5 January 2025, at 01:16 (UTC). Text is available under the Creative Commons ...

  6. 21st century - Wikipedia

    en.wikipedia.org/wiki/21st_century

    The 21st century is the current century in the Anno Domini or Common Era, in accordance with the Gregorian calendar. It began on 1 January 2001 , and will end on 31 December 2100 . It is the first century of the 3rd millennium .

  7. Cataloging (library science) - Wikipedia

    en.wikipedia.org/wiki/Cataloging_(library_science)

    The Chinese Imperial Library of the Han dynasty of the 3rd century A.D. had a catalog listing nearly 30,000 items, each item similar in extent of its content to a Western scroll. [19] The first catalogs in the Islamic world, around the 11th century, were lists of books donated to libraries by persons in the community. These lists were ordered ...