So I'm applying to 9 PhD programs, 3 Urban Planning, 3 PoliSci, & 3 History PhD programs (in that order of disciplinary preference). I have two Poli Sci chairs, a History chair, and an Urban Planning prof writing LORs. I'm in an interdisciplinary MA program and applying to PhD programs, hence the range. Will this be a problem if say for the History program there's only one History prof writing the LOR? Same for Planning. Thanks.