Prokatarktikē ekthesis epi tēs ereynēs oikogeneiakōn proypologismōn tēs diexachtheisēs kata to etos 1963/64 eis tas ēmiastikas kai agrotikas periochas tēs Ellados - Preliminary report on the 1963/64 household survey in the semi-urban and rural areas of Greece