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  • Micro-organisms in water : their significance, identification and removal, together with an account of the bacteriological methods employed in their investigation / ... By Percy Frankland and Mrs. Percy Frankland.
  • Micro-organisms in water : their significance, identification and removal, together with an account of the bacteriological methods employed in their investigation / ... By Percy Frankland and Mrs. Percy Frankland.
  • Micro-organisms in water : their significance, identification and removal, together with an account of the bacteriological methods employed in their investigation / ... By Percy Frankland and Mrs. Percy Frankland.
  • Micro-organisms in water : their significance, identification and removal, together with an account of the bacteriological methods employed in their investigation / ... By Percy Frankland and Mrs. Percy Frankland.