Table of contents
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Notes and Queries
Index
Patent Notes
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Top of pageArticles
Clearing Attachment for Grain Drills - pp307 - 309
doi:10.1038/scientificamerican05141887-307b
A Perpetual Motion Machine—Will It Work? - p309
doi:10.1038/scientificamerican05141887-309
The Porcupine in the Berlin Zoological Garden - pp311 - 312
doi:10.1038/scientificamerican05141887-311
The Mechanical Working of Ballast Quarries - pp312 - 313
doi:10.1038/scientificamerican05141887-312b
