T. Bondelid,
“DEMDESS 1994 summary report”, vol. no. 441. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xi, 92 p.: 21 fig., 1994.
T. C. Thorstensen,
“Pollution prevention assessment : Sevco Tannery, Sevlievo, Bulgaria”, vol. no. 449. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. vi, 31 p.: 4 fig., 2 tab., 1994.
W. Hogrewe,
“Prefeasibility study : Sevlievo, Bulgaria”, vol. no. 451. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. vii, 22 p.: 2 fig., 9 tab., 1994.
W. Hogrewe, Abbott, D., and Jamiolkowski, M.,
“Wastewater treatment plant O&M audit training at Gabrovo and Veliko Tarnovo, Bulgaria”, vol. no. 447. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xi, 35 p.: 1 tab., 1994.
H. Wihuri,
“Water, sanitation and environment : exposure visit and seminar : 3 - 14 October 1994 : objective, methodology, programme and material : descriptive report”. IRC, The Hague, The Netherlands, p. ca. 500 p.: fig., maps, tab., 1994.