I am new user and learning. I am interested in grid layout using grid.sty and trying to get a simple two column, double-spaced document with single-spaced quotation.
I did baseline fontsize=12pt and baseline=28.8pt (twice the given option on grid package) but that caused quotation to be displayed as double-spaced. I tried to reset the environment quotation using quoting package, but I could not find the option to for singlespacing.
I tried fontsize=12pt and baseline=14.4pt as in grid manual, used setspace and \doublespacing at preamble, then alternatively gave \par\singlespacing before each environment like quotation and gridenv, and \par\doublespacing after. That apparently does the trick, but certainly NOT the correct way to achieve double-spaced document using grid package with single-spaced quotation. I have no problem with the gridenv behavior, but I really want the quotation to be single-spaced. How to properly achieve this?
The trial-and-error working example.
\documentclass[twocolumn]{article}
\usepackage[fontsize=12pt,baseline=14.4pt]{grid}
\usepackage[top=25mm, bottom=25mm,left=40mm, right=25mm]{geometry}
\setlength{\columnsep}{20pt}
\usepackage{ragged2e}
\usepackage{blindtext}
\usepackage{setspace}
\doublespacing
\begin{document}
\section{Blah! Blah!}
\blindtext
\par\singlespacing
\begin{quotation}
\noindent This is direct, displayed quotation or verbatim word-to-word copy from referenced material, when I am too lazy to paraphrase. This is done when the words exceed 40 words or so, but \bfseries{I want this to be singlespaced}.
\end{quotation}
\par\doublespacing
\blindtext
\section{Another Blurb}
\blindtext
\par\singlespacing
\begin{gridenv}
\begin{eqnarray}
\frac{\sum^X_Y}{\prod'_C} = x'' + y^{2} + z_{i}^{n}\label{eq1}\\
\frac{\int^\sum}{\int_prod'} = x'' + y^{2} + z_{i}^{n}\label{eq2}
\end{eqnarray}
\end{gridenv}
\par\doublespacing
\blindtext
\end{document}
Please help. Thank you.

\newenvironment{myquote} {\par\singlespacing\begin{quotation}} {\end{quotation}\par\doublespacing}– Steven B. Segletes Aug 21 '17 at 14:30