Ḥevrah la-haganat ha-ṭevaʻ, Israel. Miśrad ha-ḥinukh ṿeha-tarbut. Agaf ha-noʻar. Yeḥidah li-yediʻat ha-arets ṿe-limude śadeh, Bet sefer śadeh Śedeh Boḳer