It was a productive period during which he wrote 20 papers and two books: The theory of Probability Sampling with Applications to Sample Surveys and Probability in Science and Engineering which he wrote jointly with V Dupac.
Ito ay isang produktibong panahon sa panahon na kung saan siya wrote 20 mga papeles at dalawang mga libro: Ang teorya ng Probability Sampling sa Aplikasyon sa Halimbawang survey at Probability sa Science at Engineering na kung saan siya wrote sama-sama sa V Dupac.