Biblio
Improving Slow Sand Filters for Communities with Low Incomes and Limited Water. Bayamón, Puerto Rico; 2011.
Improving Slow Sand Filters for Communities with Low Incomes and Limited Water. University of Puerto Rico-RUM, PR; 2010.
Improving Slow Sand Filters (SSF) for communities with low incomes and limited water Access. University of Puerto Rico, Rio Piedras; 2010.