The first image-link here, "Painting, Drawing, Printmaking and Photographic Mandalas", is to a thumbnail index of the four galleries in this collection, which shows many more examples than you see here.  

The next four images link to those four galleries - painting, drawing, printmaking, and mandalas:  "Paintings - Mandalas and Biomorphic", "Drawings - Felt Pen and Pastel", "Printmaking:  Nearly Invisible", and "Mandalas (Photographic) in Palladium".  

The last two link to a pair of essays about this work, short and long ("Mandalas - Essays"), and to an extensive artist's statement, "Nicholas Roerich Museum Exhibit".

Tip:  if you control-click the captions below (not the images) you can open a new tab or new window, while caps-clicking the image only allows you to open a new window.  Otherwise you leave this window behind (at least with my browser).