Letter from [ ] P Robinson, Superintendent of the California Midwinter International Exposition to M M O'Shaughnessy. Seeks clarification on a fire supply pipe in Heidelberg Castle, and whether it is there on loan and should be returned to its owners.

Handwritten notes on measurements of sewer lines and pipes. Written on California Midwinter International Exposition headed paper, and with Hugh Donegan's name on bottom (possibly as a signature, although the handwriting is very similar to O'Shaughnessy's).

Brief handwritten note to M M O'Shaughnessy, requesting a meeting regarding the location of a tree in Tulare County. The note is written on the back of subscription slip for California Midwinter International Exposition. Signature [Sloss].

A typescript retrospective account of M M O'Shaughnessy's time spent working in Hawaii. The piece was written in 1920, approximately 15 years after O'Shaughnessy returned to work in San Francisco full time, having been startled by being far away from his family when the earthquake struck. The account is written in a candid style, and begins by outlining his first trip to Hawaii in 1899, to make a report on the water and soil characteristics of a sugar plantation on the Island of Maui, and details of a memorable journey there by ship. The account then goes on to outline the background to his appointment, and gives details from his survey of the Hawaiian Islands, with the most detail given on the impact of volcanic activity on local topography. His perspective on the nature of his work is given, including his experiences of working with the Japanese and Chinese workmen, and social problems on the worksite.

Photograph album documenting various irrigation projects that M M O'Shaughnessy was involved with or interested in. The first is a dam project on the Otay Lake, and the photographs show the laying of pipelines, construction of the dam, the construction of Lower Otay House, construction workers, and the industrialist Captain Charles T Hinde on site.

The album also includes photographs from earlier that decade taken during the Koolau Ditch project in Maui, Hawaii, with a memorial stone to O'Shaughnessy, the Engineer, 1904. Ed. Rogers and Jorgen Jorgensen (who was known as 'Little Boss' on site) are photographed with him.

There are photographs of bridges and canal structures from a trip to China, including the entrance to the city of Kading, and Shanghai. Photographs of railway lines and irrigation projects in Mexico also demonstrate O'Shaughnessy's interest in learning from irrigation projects elsewhere.

Several photographs in the album document his project at the Dulzura Conduit, San Diego. These images also include several candid photographs of the construction workers at the Cottonwood camp.

Photograph of the Mill Valley High School, and some images of the O'Shaughnessy family dated 1908-1909.

Several photographs of the Morena Reservoir documenting the dam project O'Shaughnessy led from 1909-1910.

The final few pages of the album show the construction of the Los Angeles aqueduct, with Chief Engineer William Mulholland and his guests photographed in a group.

All of the photographs in the album have been captioned by O'Shaughnessy. They are in no discernable order with several projects and subjects intermixed.

File of copy letters to M M O'Shaughnessy offering their congratulations on his appointment as City Engineer of San Francisco. Correspondents are W J Farey, Ed L Head, C Eccles, Ford A Carpenter, A Moretti, G McM Ross, John E Pope, Emilie Sussman, M K Miller, Herman Shainwald, Charles D Martin, Thomas W Brooks, R C O'Connor, W A Whitney, Otto von Geldern, James P Morrissey, R S Buck, R S Moore, Frank McGowan, Victor Reiter, Charles E Wilson (5 copies), L B Nutting, A L Young, Walter V Bowns, J D Grant, Francis Smith, Ernest McCullough, W W Ricker, a copy of the Dedicatory Ceremonies to Commemorate the Completion of the Mission Viaduct, Henry Michaels.

Copy letter from O'Shaughnessy to Mr Stromberg, Photographer, (26 Oct 1912) requesting copies of a photograph. Copy letter to O'Shaughnessy from A S Baldwin (25 Aug 1913) complimenting him on his editorial in the Journal of Commerce in favour of the bond election, the influence it has exerted on his own position on the matter, but notes his opposition to municipal ownership of street railroads.

Sepia photograph of a group of approximately 30 people, men, women, children, and servicemen, all smiling and looking at another camera. M M O'Shaughnessy is standing at the front and centre of the group, smiling. The group appear to be standing on a piece of railway line, surrounded by rubble. The occasion is the opening of the Twin Peaks Tunnel.

Black and white photograph of 6 men, named from left to right as: Vincent, [Molony], McAfee, Ryder, M M O'Shaughnessy and [Carmody].

Two copies of a black and white photograph of M M O'Shaughnessy with another man, unidentified. Both are smiling. O'Shaughnessy is carrying a newspaper.

Black and white photograph of M M O'Shaughnessy (right) with Mayor Sunny Jim Rolph (middle), and an unidentified man to the left of the photograph. They appear to be standing on a playing ground, with an audience on a stand behind them.