0 DATA Experimental data library 3 DATA Evaluated data library 4 DATA Experimental data library A CONF Abstract of conference B BOOK Book book.html C CONF Conference book.html J JOUR Journal journal.html K JOUR Abstract of journal P PROG Progress report report.html R REPT Report other than progress report report.html S REPT Report containing conference proc. report.html T THES Thesis or dissertation W PRIV Private communication X PREP Preprint