nikolai kardashev - transmission of information by extraterrestrial civilizations
TRANSCRIPT
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K
TRANSCRIPT
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K
1964SvA.....8..217K