Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector5787110.17816/kazmj57871MiscellaneousThe value of the tuberculin testPechnikovaV. N.info@eco-vector.com1306194036672720901202109012021Copyright © 2021, Pechnikova V.N.2021<p>Amer. Journ. of. Dis. of. Childrd , V. 57. № 3, p. 570, 1939.</p>Kazan Medical archiveКазанский медицинский архив