Ehler, Dave G.; Mattaei, A. C.; McDermott, G. W.. 1977. "El-Flo Controller Installation and Maintenance Manual". Bureau of Reclamation, Report Number GR-77-12.
Abstract:
Web Link:
http://www.usbr.gov/pmts/hydraulics_lab/pubs/GR/GR-77-12.pdf
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