Lectures 1988 to 1996
1988-1989
| September 30 | Shawna Lawlor | Indian Fire Rehabilitation |
| October 14 | Harriet Wilson | Armies Within- Your Immune System |
| November 4 | Jim Wilson/Dick Hilton | Exploring Sierran Natural History |
| December 2 | Panel Discussion | Bioethics |
| December 9 | Bob Duke | Vagabonding Alaska! |
| January 13 | Museum Staff | Friends of the Museum Slide Show |
| March 17 | Kim Snipes | Two Ways Birds Grow Up |
| April 21 | Jim Wilson | Something About Rivers |
| May 19 | Dick Hilton/Charles Dailey | Vertebrate Fossils of the West |
1990-1991
| October 9 | Local Government Officials, Dam proponents and opponents | Auburn Dam Debate |
| November 2 | Joe Medeiros | The Land Above the Trees: Alpine Ecosystems |
| November 16 | David Rosen | Graylodge Wildlife Area |
| December 7 | Dick Hilton | Earthquake Faults |
| February 22 | Dr. Greg Wheeler | Geology and Gold in the Mother Lode |
| March 8 | Dick Hilton | Galapagos Islands |
| April 19 | Dr. Susan Slaymaker | Dinosaurs and their Extinction |
| May 11 | Joe Medeiros | Calaveras Big Trees |
1991-1992
| November 22 | Joe Medeiros | The Grandeur of Trees |
| December 6 | Kim Snipes | Migration in Birds |
| January 10 | Jim Wilson | Ecosystem and the Lorax |
| January 24 | Greg Elliott | Cosumnes River Preserve |
| February 7 | Evan Jones and John Anderson | Physics for Real People and Others |
| March 6 | Dick Hilton | From the Andes to the Amazon |
| March 20 | Rebecca Gregg and Jim Wilson | Impressions of Washington State |
| April3 | Roland Bergthold | Local Ecosystems – Going, Going, Gone? |
| May 8 | Denis DeLuchi | Weather and Flying |
1992-1993
| October 23 | Dennis Deluchi | The Population Menace |
| November 13 | Linda Banta | Nutrition - Science Based |
| December 4 | Jim Wilson | On the Loose |
| January 29 | Joe Medeiros | Endangered Species |
| February 19 | Brian Houseback | Geology of the Sutter Buttes |
| March 5 | Dick Hilton | The American Southwest |
| March 26 | Kim Snipes | Sharks!! (Done twice) |
| April 16 | Roland Bergthold | Mountain Habitats - Alps and Sierra |
| April 30 | Bio. Dept. Staff | Costa Rica |
| May 14 | Rebecca Gregg | City Habitats |
1993-1994
| December 10 | Joe Medeiros | Mono Lake: A Dying (?) Gem |
| January 28 | Kevin Wolf & Otis Wollan | Water Issues of California and Placer County |
| February 11 | Dick Hilton | Galapagos, The Enchanted Islands |
| February 25 | Mark Skinner | California's Endangered Plants - Solutions for a Flora in Decline |
| March 11 | Charles Dailey | Ancient Environments of Placer Co. |
| March 18 | Frank DeCourten | Dinosaurs |
| April 8 | Harriet Wilson | DNA Manipulation |
| April 22 | Roland Bergthold | The Golden Gate to the Pygmy Forest |
| April 30 | Jim Wilson | Point Reyes National Seashore (Field Trip) |
| August 2 | Doug Thron | Headwaters Redwood Controversy |
1994-1995
| February 10 | Joe Medeiros | Costa Rica - A Naturalist's Paradise |
| February 24 | Alexander Smith | Viet Nam - Twenty Years Later |
| March 24 | Shawna Martinez | Wawona - The Giant Sequoia of the Sierra |
| April 21 | Linda Banta | Australia - The Land Down Under |
| April 28 | Lee Stetson | John Muir - Conversation With the Tramp |
| May 19 | Dick Hilton & Joe Medeiros | The Range of Light |
| July 11 | Doug Thron | Headwaters Ancient Redwood Forest |
1995-1996
| October 27 | Coke Smith | Antarctica |
| November 17 | Scott Stine | Historical Droughts of California |
| December 1 | Hank Wesselman | In Search of the Missing Link |
| January 26 | Eric Peach | The American River: a Delicate Balance |
| February 23 | Roland Bergthold | Coastal California and Italy: Comparisons |
| March 22 | Rich Gresham | Sustainable Uses of Natural Resources |
| April 19 | Lee Stetson | John Muir Among the Animals |
| April 26 | Coke Smith | Tierra del Fuego: the World's Edge |
| May 17 | Keith Geluso | Natural History and Conservation of Bats |