Listování
od 

xenoliths
xenolits
xenolity (enklávy)
xenon
xenotim
xenotime
XRD
XVIIIth INQUA Congress
xylic substrate
xylic substrates
xylite
year 1862
yearbook
yielding bolt connections
yielding steel arch supports of roadways
yielding support
Ynnan
young people
young volcanism
Younger Dryas boundary