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Search tips:
Exact phrase search: "mine ventilation" (use quotes)
Wildcard search: mine* (use asterisk to find mine, mines, mineral...)
"Keyword" searches keyword, title word and author fields
2/3 of documents are full-text indexed, choose "Full Text" instead of "Keyword" to search (this may increase the number of search results; irrelevant search results are more likely)
More search tips...
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