Losses of vitamin A and carotene from feeds during storage /

Autor Fraps, G. S. 1876-, Kemmerer, A. R.
Vydáno 1937

The relation of the spectro Vitamin A and carotene content of butter to its vitamin A potency measured by biological methods /

Autor Fraps, G. S. 1876-, Kemmerer, A. R.
Vydáno 1938