Help identify the author's initials

[Marina56]

Dear experts! I'm new to your forum. I am very uncomfortable to request when we first met. However, decided, finally.
        The fact that I have some work to get me from my father. He was a passionate collector of books. And thanks to him I have a large well-chosen library of the old Russian book. He was a doctor, all his life working on 1.5 rate, but the extra money in the family was not. Although second-hand bookshop to buy books in his life. These, in my opinion, wonderful watercolors remember from childhood. Likely - they were gifts. Many patients were aware of his passion and ...
  Help, if possible, identify the author of these works on initials. AS One signature Pencil - the name of the Finnish city (then still Russia Empire) NYSLOTT 1913 AS On the second - Nabenbil 1911. AS
I would like to learn more about this talented artist.
I am afraid of tiring you, but I would have asked more about one painting, too, with the initials.
Thank you in advance for any of your version.