Removal of hardness from well water using a solar still by K.T. Oladepo

“…The solar still was constructed with a 2 mm thick galvanized iron sheet with basin area of 800 mm x 600 mm and covered with transparent plain glass sheet of thickness 4 mm. …”
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Branch libraries in six Nigerian universities: a study of university-wide library systems by Benson E. Edoka

“…Usable responses were received from 46(71.9%) of the branch libraries, 146(71.2,%) heads of academic units and 90(71.4%) librarians from the six universities. …”
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