TY - BOOK ID - 136208326 TI - The optimum population for Britain : (proceedings of a symposium held at the Royal geographical society, London, on 25 and 26 September, 1969) PY - 1970 PB - London Institute of biology DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:136208326 AB - ER -