B. R. Ordóñez

Epidemiological study of lead levels in children and in the household environment in Ciudad Juárez, Chihuahua, Mexico, in relation to an area near a foundry in 1 Paso, Texas, U.S.A.

B. R. Ordóñez, L. R. Romero, I. R. Mora, 1976 .

Practical Problems of Collecting Samples of Biological Media in Developing Countries

B. R. Ordóñez, 1988 .