[Answers to readers' letters].
D000818:Animals; D004022:Dictyocaulus Infections; D005536:Foot-and-Mouth Disease; D006133:Growth Substances; D006798:Housing; D012582:Schools, Veterinary; D014586:USSR; D014730:Veterinary Medicine; D014731:Veterinary Service, Military
D006133:Growth Substances
Otvety na pis'ma chitateleĭ.