13.-0956. Mesozoic.

Watsan matters
13.-0955. Mesophilic composting.
13.-0954. Mesophile.
13.-0953. Menstruation.
13.-0952. Menstruation Hygiene Management - ( MHM ).
13.-0951. Membrane.
13.-0950. Membrane fouling.
13.-0949. Membrane filtration.
13.-0948. Membrane bioreactor - ( MBR ).
13.-0947. Megacity.
13.-0946. Medical waste.
13.-0945. Mechanised water pumps.
13.-0944. Mechanical uses.
13.-0943. Maximum contaminant level goal - ( MCLG ).
13.-0942. Maximum contaminant level - ( MCL ).
13.-0941. Maturation pond.
13.-0940. Mass-burn incinerator.
13.-0939. Marsh.
13.-0938. Marketing expertise.
13.-0937. Market-based programming - ( MBP ).
13.-0936. Market-based development approach - ( M4P ).
13.-0935. Marine.
13.-0934. Marine transgression.
13.-0933. Marine regression.
13.-0932. Marginal cost.
13.-0931. Manure.
13.-0930. Manual pit emptying technology - ( MAPET ).
13.-0929. Manual emptying and transport.
13.-0928. Manometer.
13.-0927. Manhole.