There are no major changes in three versions that Kahn developed between 1966 and 1968.
The first was developed in October 1966 through July 1967, the second and third, through November 1968.
The first shows a building divided into three parts encompassed in a square: an inner zone of three stories of concrete topped by a pyramidal roof, an intermediate zone with a mezzanine dominated by wood for storage of books, and an outer zone containing spaces for working and reading, expressed by a brick facade.
This structural morphology, differentiating the form and use of the space remains unchanged throughout the three stages mentioned.
Variations and adjustments, sometimes as a result of restrictions imposed by the customer, took place primarily in different aspects of what Kahn called the design of the building: the walls, corners, the section and the resolution of the central lighting zenith.