E. Nissen-Petersen and Lee, M.,
“Rock catchment dam with self-closing watertap”, vol. no. 3. ASAL Rainwater Harvesting, Nairobi, Kenya, p. 40 p. : fig., 1990.
E. Nissen-Petersen and Lee, M.,
“Shallow wells with bucketlift”, vol. no. 4. ASAL Rainwater Harvesting, Nairobi, Kenya, p. 26 p.: fig., 1990.
E. Nissen-Petersen and Lee, M.,
“Spring protections”, vol. no. 6. ASAL Rainwater Harvesting, Nairobi, Kenya, p. iii, 29 p.: fig., 1990.
E. Nissen-Petersen and Lee, M.,
“Sub-surface and sand-storage dams”, vol. manual no. 5. ASAL Rainwater Harvesting, Nairobi, Kenya, p. iii, 43 p.: fig., 1990.
E. Nissen-Petersen and Lee, M.,
“Water tanks with guttering and hand-pump”, vol. no. 1. ASAL Rainwater Harvesting, Nairobi, Kenya, p. ii, 52 p. : fig., tab., 1990.