primary sewage treatment
31Onondaga Lake — Location Onondaga County, New York, USA Coordinates …
32Cholera — Classification and external resources Scanning electron microscope image of Vibrio cholerae ICD 10 A …
33Dubai — This article is about the city and emirate. For other uses, see Dubai (disambiguation). Dubai إمارة دبيّ   Emirate   Emirate of Dubai …
34National Register of Historic Places listings in Providence, Rhode Island — Location of Providence in Rhode Island This is a list of the National Register of Historic Places listings in Providence, Rhode Island. This is intended to be a complete list of the properties and districts on the National Register of Historic… …
35Water pollution — Raw sewage and industrial waste flows across international borders New River passes from Mexicali to Calexico, California. Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater). Water p …
36Psyttaleia — Infobox Greek Isles name = Psyttaleia native name = Ψυττάλεια skyline = sky caption = coordinates = coord|37|56|26|N|23|35|17|E|display=inline,title|region:GR type:isle chain = Saronic Island isles = area = .375 highest mount = elevation = periph …
37Mexico — /mek si koh /, n. 1. a republic in S North America. 97,563,374; 761,530 sq. mi. (1,972,363 sq. km). Cap.: Mexico City. 2. a state in central Mexico. 6,245,000; 8268 sq. mi. (21,415 sq. km). Cap.: Toluca. 3. Gulf of, Mexican, Golfo de México /gawl …
38Columbia Slough — Coordinates: 45°38′36″N 122°46′07″W / 45.64333°N 122.76861°W / 45.64333; 122.76861 …
39public health — public health, adj. health services to improve and protect community health, esp. sanitation, immunization, and preventive medicine. [1610 20] * * * Science and art of preventing disease, prolonging life, and promoting health through organized… …
40building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
