+a.out(5) a.out: assembler and link editor output.
+acct(5) acct: execution accounting file.
+ar(5) ar: archive (library) file format.
+core(5) core: format of memory image file.
+dir(5) dir: format of directories.
+dump(5) dump, ddate: incremental dump format.
+environ(5) environ: user environment.
+filsys(5) filsys, flblk, ino: format of file system volume.
+group(5) group: group file.
+mpxio(5) mpxio: multiplexed i/o.
+mtab(5) mtab: mounted file system table.
+passwd(5) passwd: password file.
+plot(5) plot: graphics interface.
+tp(5) tp: DEC/mag tape formats.
+ttys(5) ttys: terminal initialization data.
+types(5) types: primitive system data types.
+utmp(5) utmp, wtmp: login records.
+wtmp(5) wtmp: user login history.