Cite
APA Citation
Unknown (1990). The pendulum book. Saffron Walden : C.W. Daniel. http://access.bl.uk/ark:/81055/vdc_100048447928.0x000001
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Unknown (1990). The pendulum book. Saffron Walden : C.W. Daniel. http://access.bl.uk/ark:/81055/vdc_100048447928.0x000001