Homer Dodge Martin

Homer Dodge Martin (1836-1897) was an American landscape artist most commonly associated with the tonalists though there are some echoes of the Hudson Valley School in his work as well.

 A North Woods Lake (1867)

 Highlands on the Hudson

 Lake George

 In the Housatonic Valley (1850s)

 In the Adirondacks (1881)

 Landscape with Fishermen

 The Iron Mine, Port Henry, New York (ca. 1862)

[about this painting]

 Saranac Lake (Morning)

 Sunset, Adirondack Lake (ca. 1870)

Toward the Adirondacks

 The Sand Dunes (1887)

Here's a color-corrected version of the preceding. Which do you prefer?

I haven't seen the original so I don't know which is more accurate.

Seymour Joseph Guy

Seymour Joseph Guy (1824-1910) was an American genre painter, born in England.

 An Interesting Book

 At the Brook

 A Bedtime Story (1878)

 Story of Golden Locks (ca. 1870)

[interesting to compare the two versions of t his painting]

 At the Opera (1887)

 At the Watering Trough

 Guilty

 Making a Train (1867)

[about this painting]

 One for Mommy, One for Me (1881)

Howard Russell Butler

Howard Russell Butler (1856-1934) was an American landscape painter. He did a series of paintings in the area of what is now Zion National Park in southern Utah.

Clearing after September Gale, Maine Coast (ca. 1924)

 Seaweed Gatherers (1886)

The next four are paintings of Zion National Park. (See more here.)

Ferdinand Richardt

Ferdinand Richardt (full name Joachim Ferdinand Richardt, 1819-1895) was an American landscape painter born in Denmark.

 Independence Hall in Philadelphia (1858-63)

 Swedish Mill (1847)

 Countryside Along the Susquehanna (1858)

 Trenton High Falls (1858)

 View of Harper's Ferry (1850s)

 View of Mount Vernon (1858)

 View of Niagara Falls

 View of the Mississippi (1858)

View of the Upper Mississippi (1865)

Charles Harold Davis

Charles Harold Davis (1856-1933) was a landscape painter. Wikipedia calls him an impressionist, but his works look more tonalist to me.

A Clearing

 A View to the River

 Afternoon Shade, Summer

 A Path along the River

 Clearing after a Storm (1897)

 August (ca. 1908)

 Outside the Village (1883)

 May Morning (ca. 1915)

 Twilight over Plum Island and the Parker River (1887)

Champ de Ble (1883)

Paintings by Williams

 William Hahn: Return from the Bear Hunt (1882)

 William Edward Norton: Sailing Boats in the Mist

 William Henry Lippincott: Farm Interior - Breton Children Feeding Rabbits (1878)

 William Henry Burr: The Intelligence Office (1849)

 William de la Montagne Cary: The Travois (ca. 1874)

 William de la Montagne Cary: The Wigwam

 William Henry Holmes: Cliff Houses on the Rio Mancos, Colorado (1878)