| http://www.w3.org/ns/prov#value | - schema:name Flight tests of a helicopter in autorotation, including a comparison with theory@en ; schema:numberOfPages 12 ; schema:productID 38201730 ; schema:publication <http://www.worldcat.org/title/-/oclc/38201730#PublicationEvent/washington_d_c_national_advisory_committee_for_aeronautics_1947> ; schema:publisher <http://experiment.worldcat.org/entity/work/data/41321302#Agent/national_ad
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