That combination doesnt exist in nature so far as I know.
Image #1: I think that he made a cardstock mask to cover the snowfield and printed in the sky. Ralph Lambrect has displayed similar prints that I think he explained were masked and printed separately.
If you look at the hill near the horizon to the left side of the frame, there appears to be a black outline that doesnt quite look convincing. I think that I see a similar black line of demarcation separating the snowfield from the mountains in the distance in the right side of the image.
Theres a possibility that the sky and snowfield were two separate negatives that were skillfully combined. If this is the result of two or more negatives, they might have been shot from the same position in the same direction with the same lens, but under different weather conditions.
One of the tools that used to be common in combination printing (more than one negative) was a glass sheet dodging table. It places a large horizontal sheet of glass at varying heights between the lens and paper. You can place black paper or cardstock cutouts to cast shadows of carefully cut shapes to doge precise areas. The farther the dodging pieces are from the paper the softer the transition between dodged and open areas.
You can also apply deposits of lipstick or crayon in various densities to the glass to lighten selected areas.
One of my Kodak books shows a man using cardstock or paper cutouts on a glass plate dodging table with a Leitz Condenser enlarger. I think it might be Quality Enlarging With Kodak Black and White Papers, but Im not certain.
http://www.amazon.com/Quality-Enlarging-Kodak-Black-Papers/dp/0879852798