Lot of ten (10) early California stereoviews on original card mounts (six on bright orange mounts with pink versos, four on yellow mounts), published by Thomas Houseworth & Co. and Lawrence & Houseworth, San Francisco, ca. 1865–1873. The lot includes: 

1. No. 1754, The Cross-Cut in the Big Tree: Loggers posed around a massive crosscut section of tree with their various trade implements clearly visible. Orange mount.

2. No. 890, Fallen Tree, "Father of the Forest": Close environmental view showing ladies seated and standing along the massive trunk of a legendary fallen redwood. Orange mount with pink verso.

3. No. 890 Fallen Tree, "Father of the Forest": Another view showing well-attired ladies and gentlemen perched along the massive trunk of a fallen tree. Orange mount with pink verso.

4. Trunk of the Fallen "Father of the Forest": Side profile documenting the colossal scale of the splintered trunk against the forest floor. Orange mount with pink verso.

5.No. 863 Section of the Original Big Tree - and house on the stump:   A woman sits on a horse alongside a massive cross-section of a tree with a round house to her back. Orange mount with pink verso.

6. No. 1741 "Wahwonah" - Or Big Tree Point: A group of men stand atop a rocky outcrop beneath the barren branchs and trunk of a pine tree. Orange mount with pink verso.

7. No. 892, Stump of the Big Tree, Eagle Wing: Yellow mount view featuring visitors standing in the hollow of the immense root system and buttress base.

8. No. 910, Pluto's Chimney, Front or Top View: Dramatic vertical composition showing a fire-hollowed chimney tree soaring toward the canopy. Yellow mount.

9. No. 1015, Section of the Original Big Tree, Log View: Immense cross-section of the trunk felled in 1853, showing tourists atop the bark-stripped log. Yellow mount.

10. Mammoth Trees, California - Section of the Big Tree with Railed Walkway: Horizontal study showing the sawn cylinder trunk enclosed by a protective split-rail observation fence. Yellow mount.

The versos retain clear printed publishing credits across several distinct stages of the firm's history, including the early "Lawrence & Houseworth, Opticians, 317 & 319 Montgomery St." imprint, the later "Thomas Houseworth & Co." imprint, and a prime example of the Paris 1867 International Exposition prize medal imprint.

[Stereoview, Stereocard, Big Trees, Giant Sequoia, Sequoiadendron giganteum, California, Western Americana, Calaveras Grove, Mariposa Grove, Fresno Big Trees, Father of the Forest, Pavilion, Dance Floor, Stump of Original Big Tree, Mammoth Tree Hotel, Thomas Houseworth, Lawrence & Houseworth, San Francisco, 19th Century Photography]

Overall condition is very good. The albumen prints retain crisp detail, balanced deep tones, and excellent stereo depth, exhibiting minor scattered foxing, faint edge toning, and honest corner rounding consistent with age. Card mounts remain flat and sturdy.