"Selenium." . . . . . . . . . "Selenium; its geological occurrence and its biological effects in relation to botany, chemistry, agriculture, nutrition, and medicine"@en . "Selenium; its geological occurrence and its biological effects in relation to botany, chemistry, agriculture, nutrition, and medicine" . . . . . . . . "Selenium, its geological occurence and its biological effects in relation to botany, chemistry, agriculture, nutrition, and medicine" . . . "Selenium; its geological occurence and its biological effects in relation to botany, chemistry, agriculture, nutrition and medicine" . . "Selenium : its geological occurrence and its biological effects in relation to botany, chemistry, agriculture, nutrition and medicine" . . "Sélénium Toxicologie." . . "Selen." . . . . "Plants, Effect of selenium on." . . "Poisons." . .