No; they will be protected by copyright until 2068 (i.e., 70 years after his death).
His works that were published in the USA with copyright notice prior to 1978 will not become public domain until 95 years after their date of publication.
For example, The Teachings of Don Juan, published in 1968, will become public domain in 2064, having expired December 31, 2063,
When a copyright expires, the work enters the public domain. In the public domain, the work is no longer protected by copyright law, and anyone is free to use, reproduce, or modify it without permission or payment.
Materials can enter the public domain when copyright term expires, protection is not renewed (renewals are not available for new works), the creator donates the work to the public domain, or the materials are a work of the US Government.
The work itself is in the public domain, but certain transcriptions, adaptations, performances, and recordings may still be protected.
The original work is probably in the public domain. Modern translations of the bible, however, are almost certainly protected by copyright.
Since it was published in 1906, which was prior to 1923, the work itself is in the public domain. However certain editions of it may still be protected, at least to the extent they contain "creative and original work" not in the public domain editions.
Public domain means not covered by a valid copyright, anyone can use such material anyway they want. If a copyright expires or becomes invalid for some reason the work enters the public domain.
If a work is within the public domain, it means that work may be used or modified or republished by any person, without need for royalties or fear of copyright infringement.
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Her work would be copyrighted.
It means that that piece of work is freely usable by any member of the public without having to pay royalties and/or fear of being the subject of a (non-frivolous) patent, trademark or copyright infringement lawsuit.
Materials enter the public domain if...Copyright term has expiredProtection was not renewed (renewal is not available for new works)The creator voluntarily donated the work to the public domainThe material is a work of the federal government in accordance with 17USC105
The original work remains in the public domain; copyright in the new work is not a renewal of the original protection: it is an entirely new copyright. For example, if I do a new translation of the Dead Sea Scrolls, I control copyright over my translation, but the original texts are still in the public domain. If I record a performance of a Bach chorale, I control copyright over that recording, but the original work is still in the public domain.