by Portch, S R
Published in Georgia hospitals today (01.10.1995)

by Bejarano W, Portch S
Published in Publicacion Miscelanea - Instituto Nacional de Investigaciones Agropecuarias (Ecuador). (no. 20) (1974)

by Portch, S. (Potash and Phosphate Institute (Hong Kong))
Year of Publication 1989

by Portch S, Hicks J.L
Published in Journal of soil and water conservation (1980)

by Portch, Stephen
Published in Quest (National Association for Kinesiology in Higher Education) (01.05.1999)

by Chen, F, Portch, S, Jin, J.Y
Year of Publication 2003

by Jin, J.Y, Portch, S
Published in International Symposium on the Role of Sulphur, Magnesium and Micronutrients in Balanced Plant Nutrition / sponsors, the Potash and Phosphate Institute of Canada ... [et al.] [Sam Portch, editor] (1991)

by Bejarano, W, Lainez C, J. (Instituto Nacional de Investigaciones Agropecuarias, Quito (Ecuador)), Portch, S

by Bejarano W, Lainez C J, Portch S

by Mutert, E, Portch, S, Woo, Y.C
Published in Agro-Chemicals News in Brief (ESCAP/FAO/UNIDO) eng (Oct-Dec 1993) V. 16(4) p. 20-30 (1993)

by Portch, S. (Potash and Phosphate Inst., Hong Kong (China))
Published in Agro-Chemicals News in Brief (ESCAP/FAO/UNIDO) (01.04.1994)

by Bejarano W, Lainez C J, Portch S
Published in Revista INIAP (1974)

by Bejarano, W, Lainez C, J, Portch, S
Published in Revista INIAP (Ecuador) (01.12.1974)

by Jonas, J, Tejeira, R, Aleman R, R, Portch, S
Year of Publication 1976

by Bejarano, W. (Instituto Nacional de Investigaciones Agropecuarias, Quito (Ecuador)), Portch, S
Published in Publicacion Miscelanea - Instituto Nacional de Investigaciones Agropecuarias (Ecuador) (01.10.1974)