TITLE    : Cannot read man pages, where nroff and tbl ?
OS LEVEL : AIX 
DATE     : 10/03/99
VERSION  : 1.0

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They are not installed as part of the base installation.
You need to install the following filesets using smit :-

AIX 3.2.5 you need to install txtfmt.tfs.obj

AIX 4.x, you need to install bos.txt.tfs
(Text formating services)