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125 Years ARCADIS & KNHM (1)1st Centenary of Ministry of Public Works (1)20 éves az ENSZ (2)21st Anniversary of Liberation (1)25th Anniv. of the Intl. Irrigation and Drainage Commission (4)25th Anniversary of CONAGUA (6)35th Anniversary of Relations with PR China (1)380th Anniversary of the City of Rybnitsa (1)3rd year of Suez channel reopenning (1)40 years Inter-American Development Bank (BID) (3)42nd Anniversary of the Correctionist Movement (1)50th Anniversary of King Bhumibol's Accession (1)50th Anniversary of Kuwait Fund For Arab Development (2)50th Anniversary of United Nations (1)60 years Madurodam (2)7 wonders of Cuban engineering (1)70th Memorial Anniversary of Paul Harris (2)75th anniversary of Pan American health education (2)7th Anniversary New Regime (2)80th Death Anniversary of Leonard B. Smith (1)African Development Bank (1994) (1)Airplane over Different Construction Works (5)Al Masarrat & Ash'Sharqiyah Sand Water Supply Scheme (4)Allgäu Mail Kempten (1)Amami District Provisional Issues (1)Ancient Water Systems in Israel (2)Anniversaries and Events 1962 (1)Anniversaries and Events 1996 (2nd) (1)Anti-tuberculosis Fund 1952 (2)Aqueducts and Sewage System (1)Arabian Water Day (1)Architectural Achievements - 1959 (1)Assistance (1)Aswan Dam (2)ATM 2009 (1)Ausipex 1984 (1)Az Ötéves Terv épületei (5)Bắc Hưng Hải Irrigation System (2)Beauty of our homeland (2018) (1)Bicentenary of Directorate-General of PWWM (3)BIE/IBE - International Bureau of Education (1)Birthplace of Lord Buddha (2)BIT/ILO - Nemzetközi Munkaügyi Szervezetet (3)Booklet Definitives - Landscapes - Delta Works (1)Boulder Dam Issue (1)Burma (3)Burma (Shan States) (2)C.E.P.T. - Víz (5)Children welfare (1)Civil Engineering (1)Colonial Empire (10)Colonial Empire overprint,TIMOR (2)Colonial Empire, overprint LIBERTAÇAO (2)Commemorative Series - 1977 (1)Commission for Sustainable Development, Tela (1)Completion of the Delta Works (4)Congress (1)Construction of a Water Pipeline to Conakry (5)Construction of Water Diversion Project from South to North (1)Cyprus Through the Ages (1)Definitives 1967-1969 (1)Definitives 1979-86 (2)Definitives S.Tomé 1938 (4)Development Programme-Water Resources (4)Development Projects (1)Developments (2)Diplomatic Relations with China, 60th Anniversary (2020) (1)Dujiangyan Irrigation Project (1)Dunkirk (1)East Ghor Canal Project (5)Electricity and waterworks (1)Electrification (4)Elektromos ipar (4)Engineering Skill (1)Environmental Care (1)Environmental Summit (1)EPAL, 150 Years (5)Épületek (2)Europa (C.E.P.T.) 1977 - Landscapes (3)Europa (C.E.P.T.) 1983 - Great Achievements of Human Genius (4)Évfordulók (1)Express Schatztruhe Jessen (1)Fiscal (1)Fortschritt in Costa Rica (1)Függetlenség (3)Gabčíkovo Dam (4)Golden Jubilees (1)Gonabad Gasabaeh Qanat World Heritage (2)Government Programs and Responsibility (1)Hivatalos bélyegek (2)Huinco Hydroelectrical Power Station (2)I love Holland (2)Inauguration of the Tsengwen Reservoir (3)Indigenous motifs (4)Industrial Archaeology (2)Industrial Heritage (4)Innovative Netherlands (2021) (1)Int. 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Personalised (1)National Day 2013 (1)National Grazing Strategy (2)National Water Week and Water Day (9)Nationalized Electricity Industry (1)Netherlands in atlas (3)New Constitution Definitives (1)Oct. 21 revolution, 10th anniversary (1)OMS/WHO - World Health Organization (1)ONU/UNO - United Nations European Office (1)Opening of the Volta River dam (4)Parcel post (2)Parcel Post - Overprinted Encomiendas (1)Paul Harris 2017 (1)Paul P. 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Aqueducts (4)Tunisia's Archeological Sites (1)Turisztikai reklám (2)Turizmus (4)Turkey-TRNC Water Pipeline Project (2)UNESCO World Heritage (2)Unesco Year of Fresh Water (2)Vidéki motívumok (3)Water and Electricity Year (4)Water conservation in the desert (3)Water Supplies (1)Waterwheels of Hama (3)Windmills and Watermills (6)World heritage Sites (3)World Water Day (2)XXV years of peace (1)Zuiderzee Project (1)Nem sorozattagok (44)