Esta obra está no dominio público xa que foi publicada nos Estados Unidos de América entre 1929 e 1963, e aínda que puidese ter ou non un aviso de dereitos de autoría, os dereitos non se renovaron. Agás que o autor leve falecido o período de tempo requirido, mantén os dereitos de autoría naqueles países que non aplican a regra do período máis curto para obras nos Estados Unidos, como o Canadá (70 pma), China continental (50 pma, non Hong Kong ou Macao), Alemaña (70 pma), México (100 pma), Suíza (70 pma), e outros países con tratados individuais. Vexa Commons:Hirtle chart para máis explicacións.
This work was first published in South Africa and is now in the public domain because its copyright protection has expired by virtue of the Copyright Act No. 98 of 1978, amended 2002. The work meets one of the following criteria:
It is an anonymous work or pseudonymous work and 50 years have passed since the date of its publication.
It is a broadcast or sound recording and 50 years have passed since the year the programme was published.
It is a cinematographic or photographic work and 50 years have passed since the date of its creation.
It is an artistic, literary or musical work created under the direction of the state or an international organization and 50 years have passed since the year the work was published.
It is another kind of work, and 50 years have passed since the year of death of the author (or last-surviving author).
A South African work that is in the public domain in South Africa according to this rule is in the public domain in the U.S. only if it was in the public domain in South Africa in 1996, e.g. if it was published before 1946 and no copyright was registered in the U.S. (This is the effect of 17 USC 104A with its critical date of January 1, 1996.)
Pés de foto
Engada unha explicación dunha liña do representa este ficheiro
Este ficheiro contén información adicional, probablemente engadida pola cámara dixital ou polo escáner usado para crear ou dixitalizar a imaxe. Se o ficheiro orixinal foi modificado, poida que algúns detalles non se reflictan no ficheiro modificado.