Bitsavers has a quite a few documents at
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/pc/rt/
59X7877_Fortran_77.pdf
AIX_Brochure_1989.pdf
AIX_RT_SNA_Services_May89.pdf
GC23-2002-0_AIX_Family_Definition_Overview_Jul88.pdf
GC24-3381-0_AIX_Communications_Handbook_Jun89.pdf
SC23-0129_VS_FORTRAN_Users_Guide_Mar87.pdf
SC23-0130_VS_FORTRAN_Reference_Manual_Mar87.pdf
SC23-0787-0_Installing_and_Customizing_the_AIX_Operating_System_V2.1.2_Sep87.pdf
SC23-0787-0_Installing_and_Customizing_the_AIX_Operating_System_Version_2.1_Jan87.pdf
SC23-0788-1_Bibliography_and_Master_Index_2ed_Jun87.pdf
SC23-0790-0_AIX_Operating_System_Commands_Reference_Version_2.1_Jan87.pdf
SC23-0791-0_AIX_Operating_System_Communications_Guide_Version_2.1_Jan87.pdf
SC23-0793-0_Managing_the_AIX_Operating_System_Version_2.1_Jan87.pdf
SC23-0794-0_Using_the_AIX_Operating_System_Version_2.1_Jan87.pdf
SC23-0799-0_INed_Jan87.pdf
SC23-0804-0_X-Windows_Users_Guide_and_Reference_Version_1.1_Sep87.pdf
SC23-0808-0_AIX_2.1.1_Technical_Reference_Volume_1_Jun87.pdf
SC23-0808-0_AIX_Operating_System_Technical_Reference_Volume_1_Version_2.1_Jan87.pdf
SC23-0809-0_AIX_2.1.2_Technical_Reference_Volume_2_Sep87.pdf
SC23-0816-0_AIX_2.1_Virtual_Resource_Manager_Programming_Reference_Jan87.pdf
SC23-0817-0_AIX_2.1_Virtual_Resource_Manager_Device_Support_Jan87.pdf
SC23-2011-1_AIX_2.2_Operating_System_Commands_Reference_Volume_1_Sep88.pdf
SC23-2081-1_AIX_2.2_Operating_System_Commands_Reference_Volume_2_Sep88.pdf
SX23-0715-0_INed_Quick_Reference.pdf