Two copies of a black and white photograph of Senator [Key] Pittman speaking at the dedication of the Pittman plaque at O'Shaughnessy dam. He is surrounded by a group of men perching on automobiles and listening.

Black and white photograph of M M O'Shaughnessy and a group of 12 other men at the dedication of the Pittman plaque at the O'Shaughnessy dam.

Two copies of a black and white photograph of Supervisor Shannon (left) and Senator Pittman (right) shaking hands at the dedication of the Pittman Plaque, at the O'Shaughnessy dam.

Black and white photograph of M M O'Shaughnessy (left) and Senator Pittman (right) at the dedication of the Pittman Plaque, at the O'Shaughnessy dam.

Black and white photograph of M M O'Shaughnessy (middle) and two unidentified men on site.

Black and white photograph of a large group of men and women having a picnic in the San Mateo Recreation Park.

Black and white photograph of a large group of men standing around a picnic table in the San Mateo Recreation Park.

Black and white photograph of a picnic area in the San Mateo Recreation Park.

Black and white photograph of a3 men talking in the San Mateo Recreation Park at La Honda.

Black and white photograph of a man holding a glass bottle and smiling.