SEPlib90 gives programmers a storage format for irregular 3-D seismic data, and a library of accessor routines for bringing them into memory. However, experience showed early and often that I/O and data handling were cumbersome for SEPlib90 application programmers. Here we present a Fortran 90 library and data structure that overlay SEPlib90. The library simplifies various non-geophysical tasks such as data input and output; and makes windowing, allocation and deallocation of irregular traces, straightforward. In addition, the library serves as the link between SEP's new C++ framework, GOON (Geophysical Object-Oriented Numerics), and SEPlib90.