I am unable to see images. However, I can help you analyze the potential objectives of the Lewis and Clark expedition in relation to an illustration you might be looking at.
If the illustration depicts landscapes, rivers, or maps, it might best represent the objective of gaining knowledge of the region's geography. If it shows interactions or encounters with Native Americans, it might more likely reflect the objective of learning about the territory's Native Americans. Conversely, if it depicts travel routes, it may represent the goal of documenting a safe route to the Pacific Ocean.
If you describe the illustration, I can help you determine which objective it most closely aligns with.