
- Author: Добровольский В.А.
- Language: Русский
- Year: 1968

- Author: Синярев Г.Б. Добровольский М.В.
- Language: Русский
- Year: 1955

- Author: Проф. В. А. Добровольский
- Language: Русский
- Year: 1936

- Author: Добровольский В.А.
- Language: Русский
- Year: 1981

- Author: Добровольский В.А.
- Language: Русский
- Year: 1980

- Author: Добровольский В.А.
- Language: Русский
- Year: 1974

- Author: Добровольский В.А.
- Language: Русский
- Year: 1968

- Author: Городникова Добровольский.
- Language: Русский
- Year: 1988