Naegel, L.C.A.

Naegel, L.C.A., Real, J.G. & Mazaredo, A.M., 1991. Designing a spiral pump for irrigation. , pp.p. 30-31: 1 fig., photogr. Available at: https://nl.ircwash.org/sites/default/files/Naegel-1991-Designing.pdf.