The Maya calendar has been in the news recently, e.g., "Found: The Oldest Maya Calendar (and No, the World's Still Not Ending)" (Time Science) and "Oldest Known Maya Calendar Found; No Signs of 2012 Doomsday" (ABC News). The Maya calendar is also a topic in an exhibit at the University of Pennsylvania Museum of Archaeology and Anthropology: Maya 2012: Lords of Time.
Searching in WebDewey for "maya calendar" (or browsing for it in the WebDewey Relative Index) yields the built number entry:
529.32978427 Maya calendar
The number is built with 529.32 Calendars of specific religions and traditions plus 978 from 299.78 Religions of specific groups and peoples, following the add instruction at 529.32, plus 427 from T5—97427 Peoples who speak, or whose ancestors spoke, Yucatecan languages, following the add instruction at 299.78. The entry for T5—97427 has the class-here note: "Class here Yucatecan Maya." An example of a work classed in 529.32978427 is Maya Calendar Origins: Monuments, Mythistory, and the Materialization of Time. It has the following LCSHs:
Works that emphasize controversial knowledge about the end of the world—whether arguing for or against the idea—are classed in 001.9 Controversial knowledge, which has the including note: "Including . . . . the end of the world." That number can be found in WebDewey by browsing the Relative Index for "end of the world" or by searching for it. Because the topic is in an including note, no further addition is possible. An example of a work classed in 001.9 Controversial knowledge is The End of Time: The Maya Mystery of 2012. It has the LCSHs: