| Table of contents riha vol.42 no.3 La Habana Sept.-Dec. 2021 ARTICULOS ORIGINALES | | | | · Concentration of nitrates, phosphates, surfactants and their relationship with rainfall in the Puyo River Ríos Rodríguez, Fabricio Antonio; Abril Saltos, Ricardo Vinicio; Carvajal, Edison Xavier; López Adriano, Katherine Pamela; Rodríguez Naranjo, Henry Estuardo
| | | | · Environmental and anthropic hazards on the waters in the Ondjiva Commune, Angola del Puerto Sánchez, Julio Antonio; Martínez Valdés, Yaset
| | | | · Microbiological characterization of the air in the urban area of Calceta, Manabí, Ecuador Vivas Saltos, Holanda Teresa; Calderón Pincay, José Manuel; Delgado Moreira, María Isabel; Abril Saltos, Ricardo Vinicio
| | | | · Incidence of physical-chemical variables of water and sediment on spiny lobster in a collection center Romero López, Teresita de Jesús; Suárez Álvarez, Gerardo; Pérez Daniel, Aylín
| | | | · Leonhard Euler's contributions to the development of Hydraulics Riaño Valle, Félix
| | | | · Legal challenges for the implementation of the environmental flow in Cuba Cánovas González, Daimar; Martínez Valdés, Yaset
| | | | · Rain-runoff model for the Yanuncay river basin in Cuenca, Ecuador Fernández de Córdova Webster, Carlos Javier; Arias Lastre, Pedro Pablo; Rodríguez López, Yakelín; León Méndez, Alcides Juan Felipe
| | | | · Groundwater contamination risk in the Almendares-Vento basin, Cuba Suárez González, Oscar; Valcarce Ortega, Rosa María; Vega Carreño, Marina; Rodríguez Miranda, Willy
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