Many university library systems have programs where alumni (and sometimes outsiders) can purchase access to their resources for a yearly fee. If that's unavaila

Many university library systems have programs where alumni (and sometimes outsiders) can purchase access to their resources for a yearly fee. If that's unavailable to you or cost prohibitive, most academic libraries are open to the public. When I worked at an engineering library for a large university, a good part of my day was spent helping working professional access these kinds of resources.