Association for Corporate Growth - Founded in 1954, the Association for Corporate Growth is the premier association for and about professionals involved in middle-market corporate growth, corporate development, and mergers and acquisitions. It promotes the professional interests of its members, who have assumed leadership roles in strategic corporate growth, by offering a forum for quality programs, education and networking. ACG has nearly 5,500 members representing approximately 2,500 companies in 36 chapters throughout the United States, Canada, the UK and Mexico.
http://www.acg.org

Lancaster Chamber of Commerce and Industry - One of the largest chambers of commerce in the Commonwealth of Pennsylvania and includes a wide diversity of members, including, but not limited to: agribusiness, durable goods and industrial parts and components manufacturing, service, retail, professional and financial services and technology businesses.
http://www.lcci.com

MFGGate.com - A portal and resource center for manufacturers located in Southeastern PA.
http://www.mfggate.com