Dōgen's Mountains and Rivers Sutra has been a central Zen text since its publication in the 13th century. There's a long history here of study and practice.
In this latest reflection, SFZC teacher emeritus Zoketsu Norman Fischer's commentary on the sutra is organized as 52 weeks of focused attention by Kuya Minogue, resident teacher at the Creston Zen Centre in British Columbia.
Tricycle Magazine recently featured an article about the book, published by Sumeru earlier this year, along with reflections on several other companion books on the same topic.
Here's the link: