Underground lighting in mines, shafts and tunnels.
Our rough guess is there are 73,000 words in this book.
At a pace averaging 250 words per minute, this book will take 4 hours and 52 minutes to read. With a half hour per day, this will take 10 days to read.
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Word Count
73,000 words, Guess
Page Count
292 pages
Identifiers
- Open LibraryOL19594592M
Classifications
- DDC622.47
Subjects
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