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Paul Carman asked about cross-referencing acronyms in an index.
Speaking as a user of indexes (rather than an indexing professional),
it's generally useful to repeat the page references (subheadings)
under both the acronym and its spelled-out form, particularly if the
two will be several pages apart in the final index. This avoids people
having to flip pages, always a courteous gesture. If you can't avoid
this form of cross-reference and can't repeat the subheadings, then
you're really left with a cross-reference to the spelled-out form.
--Geoff Hart #8^{)}
geoff-h -at- mtl -dot- feric -dot- ca
Disclaimer: These comments are my own and don't represent the opinions
of the Forest Engineering Research Institute of Canada.