diff --git a/52_machine_learning.Rmd b/52_machine_learning.Rmd
index 5de362f..90c0274 100644
--- a/52_machine_learning.Rmd
+++ b/52_machine_learning.Rmd
@@ -26,6 +26,12 @@ Nicholas Harvey, [CPSC 531H: Machine Learning Theory](https://www.cs.ubc.ca/~nic
 Audrey Lorberfeld, 2019-03-01, [Machine Learning Algorithms In Layman’s Terms, Part 1](https://towardsdatascience.com/machine-learning-algorithms-in-laymans-terms-part-1-d0368d769a7b)
 
 
+#### Deep learning 
+
+Sigrid Keydana, 2019-03-14, [Math, code, concepts: A third road to deep learning](https://blogs.rstudio.com/tensorflow/posts/2019-03-15-concepts-way-to-dl/) {at the [TensorFlow for R](https://blogs.rstudio.com/tensorflow/) blog}
+
+
+
 ### R
 
 Laurent Gatto, 2017-10-18, [An Introduction to Machine Learning with R](https://lgatto.github.io/IntroMachineLearningWithR/index.html)
diff --git a/59_quantitative_methods.Rmd b/59_quantitative_methods.Rmd
index 67e9419..b372b0d 100644
--- a/59_quantitative_methods.Rmd
+++ b/59_quantitative_methods.Rmd
@@ -237,8 +237,15 @@ https://www.jstatsoft.org/article/view/v074i07
 
 
 
-## Machine Learning
+## Moving Window (for raster data)
 
+### **grainchanger**
+
+"The **grainchanger** package provides functionality for data aggregation to a grid via moving-window or direct methods."
+
+- [reference site](https://laurajanegraham.github.io/grainchanger/)
+
+- github: [grainchanger: Data aggregation methods for raster data](https://github.com/laurajanegraham/grainchanger)
 
 
 
diff --git a/70_spatial_data.Rmd b/70_spatial_data.Rmd
index 13b8d7c..3b1df0f 100644
--- a/70_spatial_data.Rmd
+++ b/70_spatial_data.Rmd
@@ -1,9 +1,6 @@
 # Spatial Data (including mapping)
 
 
-
-
-
 ## Introduction
 
 Cartographic design principles
@@ -42,17 +39,23 @@ Choropleth maps
 
 ## R
 
-### Mapping in R: tutorials, etc.
+### Spatial Data in R: text books
+
+
+Roger S. Bivand, Edzer J. Pebesma, and Virgilio Gómez-Rubio (2008) [_Applied Spatial Data Analysis with R_](http://gis.humboldt.edu/OLM/r/Spatial%20Analysis%20With%20R.pdf) {PDF version of text book}
+
+Robin Lovelace, Jakub Nowosad, and Jannes Muenchow, [_Geocomputation with R_](https://geocompr.robinlovelace.net/)
 
 Edzer Pebesma and Roger Bivand, [_Spatial Data Science_](https://keen-swartz-3146c4.netlify.com/) -- textbook, work in progress.
 
+
+### Spatial Data in R: blogposts, tutorials, etc.
+
 Andrew Tran, 2019, [Mapping with R NICAR19 session](https://github.com/andrewbtran/NICAR/tree/master/2019/mapping)
 
 
 Aleszu Bajak, 2018-12-20, ["How to map point data and polygon shapefiles in R"](http://www.storybench.org/how-to-map-point-data-and-polygon-shapefiles-in-r/)
 
-Roger S. Bivand, Edzer J. Pebesma, and Virgilio Gómez-Rubio (2008) [_Applied Spatial Data Analysis with R_](http://gis.humboldt.edu/OLM/r/Spatial%20Analysis%20With%20R.pdf) {PDF version of text book}
-
 Frank Davenport (2012) ["Notes from A Recent Spatial R Class I Gave"](http://davenportspatialanalytics.squarespace.com/blog/2012/6/19/notes-from-a-recent-spatial-r-class-i-gave.html)
 
 Nick Eubank, [Merging Spatial Data](http://www.nickeubank.com/wp-content/uploads/2015/10/RGIS2_MergingSpatialData_part1_Joins.html)
@@ -63,9 +66,7 @@ Tomislav Hengl, [_A Practical Guide to Geostatistical Mapping_](http://spatial-a
 
 Robin Lovelace (2014) ["R, an Integrated Statistical Programming Environment and GIS"](http://robinlovelace.net/r/2014/11/28/r-as-a-gis-geoinformatics.html) {blog post}
 
-Robin Lovelace, James Cheshire and others, 2015-, [_Introduction to visualising spatial data in R_](https://cran.r-project.org/doc/contrib/intro-spatial-rl.pdf) {or up-to-date version on github, [Robinlovelace/Creating-maps-in-R](https://github.com/Robinlovelace/Creating-maps-in-R)}
-
-Robin Lovelace and Jakub Nowosad, 2017-08-16, [_Geocomputation with R_](http://robinlovelace.net/geocompr/)
+Robin Lovelace, James Cheshire and others, 2015-, [_Introduction to visualising spatial data in R_](https://cran.r-project.org/doc/contrib/intro-spatial-rl.pdf) {or up-to-date version on github, [Robinlovelace/Creating-maps-in-R](https://github.com/Robinlovelace/Creating-maps-in-R) {tutorial}
 
 Sharon Machlis (2016) [Create maps in R in 10 (fairly) easy steps](http://www.computerworld.com/article/3038270/data-analytics/create-maps-in-r-in-10-fairly-easy-steps.html), Computerworld (2016-03-01)