1993 Colombia
Authors: Duivenvoorden, J.F. and Lips, J.M.
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1993 Guyana
Authors: Steege, H. ter
1993 General
Authors: Touber, L., Randen, Y. van and Gijsen, N.
Authors: Herrera, L.F., Cavelier, I., Rodriguez, C.A., Mora, S.
Authors: Noij, I.G.A.M., B.H. Janssen, I.G. Wesselink, J.J.M. van Grinsven.
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